If its signed Lundburg then its Lundburg Studio glass, Davenport, California. They produce superb art glass & quite frankly many of their products are so good in quality & workmanship they magically undergo signature manipulation as in "Steuben", "Durand", etc. by unscrupulous individuals. Not their fault at all. I have buddy that swears 1/2 of the art glass shades on eBay called Steuben, Durand, Quezal, etc. are Lundburg...they are that good. High end. You probably would be better off contacting the at: http://www.lundbergstudios.com/

Seriously my favorite art glass studio work of all...absolutely top of the line stuff that at times mimics the earlier stuff.